G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/08 (2006.01) G11B 7/085 (2006.01) G11B 21/08 (2006.01)
Patent
CA 1213368
OPTICAL REPRODUCING APPARATUS ABSTRACT OF THE DISCLOSURE An optical reproducing apparatus for read-out of information recorded in parallel, substantially circular tracks on a record disc includes an optical pickup head having an object lens for focusing a light beam at the disc, a tracking servo mechanism for controlling the point of impingement of the light beam on the record disc in directions transverse to the tracks, a jump pulse generator, a drive motor for moving the optical pickup head along a radial direction of the disc, and a control circuit for driving the motor. In an access or search mode of the apparatus, the jump pulse generator provides jump pulses to the tracking servo mechanism by which the point of impingement of the light beam is made to jump across the tracks toward a desired or target track. In response to the jump pulses, the control circuit provides respective drive signals for the motor with the duration of each drive signal being greater than the duration of the respective jump pulse to compensate for the effect of the relatively large inertia of the optical pickup head.
426516
Gowling Lafleur Henderson Llp
Sony Corporation
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